It was the right call. The ball was well underthrown, Gronk had no chance at getting to it, even with the LB hugging him.

I dont get this logic. How do you know what would have happened with different variables? You are making an assumption. Saying he would have had "no chance" with a different set of circumstances sounds crazy to me.

I could understand if the pass was intercepted and then the pass interference happened, similarly to a tipped ball and pass interference happening after that gets waved off.

But I am not willing to act like I know how things would have played out had the linebacker not been committing the penalty.